Made with the finest Merino Wool, the High-Top Wool-E-Ator offers more foot insulation while still providing the great breathability and thinner fit of the popular Air-E-Ator®. The Stayfast™ cuff provides a secure, durable, dynamic fit and the sculpted Air-E-Ator® mesh weave travels all the way around the sock to aid airflow and moisture transfer. En-Duro-Skin™ construction reinforces the external heel and toe "puncture" areas, while Achill-E-Shield™ strengthens the high-stress area of the Achilles tendon area. The Sole2™ system ensures that durability and wicking co-exist in the all-important sole.